Abstract: A hollow stepped article is formed from a solid blank to reduce the material cost, and cracking is prevented in a stepped portion of large diameter when a portion of the blank is de-formed by its radial expansion.

Abstract: A hollow stepped article is formed from a solid blank to reduce the material cost, and cracking is prevented in a stepped portion of large diameter when a portion of the blank is deformed by its radial expansion.

Abstract: A hollow step-profiled shaft such as a cam shaft that is high in accuracy and excellent in productivity and requires little post-machining is being formed. To this end, a hollow stepped shaft 8 having its axis and large diameter portions 9a-12b intermediate axially between its ends is formed by a forming process in which each large diameter portion of the shaft is compressed with forming dies 32a-32d from at least three different directions approximately simultaneously towards the axis to shape the large diameter portion with a profile such as to conform to contours 38a-38d of a cavity 38 formed in a region of tips of the forming dies 32a-32d.

Abstract: A hollow stepped article is formed from a solid blank to reduce the material cost, and cracking is prevented in a stepped portion of large diameter when a portion of the blank is deformed by its radial expansion.

Abstract: Disclosed is an electromagnetic coupling designed to strengthen the magnetic force exerted from an electromagnetic coil in the direction in which a pilot clutch is operated. In the electromagnetic coupling with the pilot clutch for activating a main clutch wherein clutch plates are thrust with a retaining ring moved by magnetic force produced by an electromagnetic coil in the pilot clutch, the electromagnetic coil in the pilot clutch is surrounded with ferromagnetic material over at least two of its three facial sides other than its magnetic force exerting facial side, namely over at least its rear and outer facial sides and the ferromagnetic material is covered with nonmagnetic material.

Abstract: A hollow stepped article is formed from a solid blank to reduce the material cost, and cracking is prevented in a stepped portion of large diameter when a portion of the blank is deformed by its radial expansion.

Abstract: Improved die arrangements are provided whereby both an upper die and a lower die can easily be loaded into and unloaded from their respective die holders in a die exchanging operation. An improved die apparatus in a pressing machine in which an upper die set is securely loaded in an upper die holder fastened to a slide side for a pressing operation, comprises an arrangement whereby the upper die set is held in the upper die holder so that the upper die set can be extracted downwards from the upper die holder, wherein the upper die holder is provided with stopper means adapted to engage with the upper die set to hold the upper die set in place and adapted to disengage from the upper die set to allow the upper die set to disengage from the upper die holder.

Abstract: An improved lower die assembly is provided which allows a given lower die in a pressing machine to be replaced with another easily and in a short period of time relative to a die holder. In the lower die assembly in which a lower die is received and securely held in a die holder, the improvement comprises: a clamp means whereby the lower die when unclamped is received in the die holder so that the lower die can be extracted from the die holder upwards and then when clamped is securely held therein; and a lift means disposed below the lower die and whereby the lower die when unclamped is raised above an upper end of the die holder.

Abstract: A method whereby magnetic and nonmagnetic materials can be joined together firmly and having their joining areas freed from embrittlement and with a minimum of deformation is disclosed. Applied to the process of fitting a ring of nonmagnetic material into an annular space formed between an inner and an outer member each made of magnetic material, the method includes bringing an inner and an outer peripheral surface of the ring of nonmagnetic material each into a semi-molten state and bringing the inner and outer peripheral surfaces of the ring of nonmagnetic material into pressure contact with the inner and outer members, respectively, to join the inner and outer peripheral surfaces to the inner and outer members, respectively, by interfacial fusion.

Abstract: A method is required in which a plate-like flange member may be firmly secured at the front end of a hollow shaft member through a plastic working treatment by virtue of caulking combination, so as to manufacture a hollow shaft having a flange at one end thereof.

Abstract: A double action oil hydraulic press is provided having a main cylinder for actuating a slide and a lower part forming cylinder for actuating a lower part forming unit, wherein the operations of the cylinders are controlled through the combined control of the rotation of an oil hydraulic pump of a power unit and servo valves whereby the amount of operation oil that must be used is reduced.

Abstract: Improved die arrangements are provided whereby both an upper die and a lower die can easily be loaded into and unloaded from their respective die holders in a die exchanging operation. An improved die apparatus in a pressing machine in which an upper die set is securely loaded in an upper die holder fastened to a slide side for a pressing operation, comprises an arrangement whereby the upper die set is held in the upper die holder so that the upper die set can be extracted downwards from the upper die holder, wherein the upper die holder is provided with stopper means adapted to engage with the upper die set to hold the upper die set in place and adapted to disengage from the upper die set to allow the upper die set to disengage from the upper die holder.

Abstract: An improved lower die assembly is provided which allows a given lower die in a pressing machine to be replaced with another easily and in a short period of time relative to a die holder. In the lower die assembly in which a lower die is received and securely held in a die holder, the improvement comprises: a clamp means whereby the lower die when unclamped is received in the die holder so that the lower die can be extracted from the die holder upwards and then when clamped is securely held therein; and a lift means disposed below the lower die and whereby the lower die when unclamped is raised above an upper end of the die holder.

Abstract: Disclosed is an electromagnetic coupling designed to strengthen the magnetic force exerted from an electromagnetic coil in the direction in which a pilot clutch is operated. In the electromagnetic coupling with the pilot clutch for activating a main clutch wherein clutch plates are thrust with a retaining ring moved by magnetic force produced by an electromagnetic coil in the pilot clutch, the electromagnetic coil in the pilot clutch is surrounded with ferromagnetic material over at least two of its three facial sides other than its magnetic force exerting facial side, namely over at least its rear and outer facial sides and the ferromagnetic material is covered with nonmagnetic material.

Abstract: A hollow stepped article is formed from a solid blank to reduce the material cost, and cracking is prevented in a stepped portion of large diameter when a portion of the blank is deformed by its radial expansion.

Abstract: A method whereby magnetic and nonmagnetic materials can be joined together firmly and having their joining areas freed from embrittlement and with a minimum of deformation is disclosed. Applied to the process of fitting a ring of nonmagnetic material into an annular space formed between an inner and an outer member each made of magnetic material, the method includes bringing an inner and an outer peripheral surface of the ring of nonmagnetic material each into a semi-molten state and bringing the inner and outer peripheral surfaces of the ring of non-magnetic material into pressure contact with the inner and outer members, respectively, to join the inner and outer peripheral surfaces to the inner and outer members, respectively, by interfacial fusion.

Abstract: A double action oil hydraulic press is provided having a main cylinder for actuating a slide and a lower part forming cylinder for actuating a lower part forming unit, wherein the operations of the cylinders are controlled through the combined control of the rotation of an oil hydraulic pump of a power unit and servo valves whereby the amount of operation oil that must be used is reduced.

Abstract: A method is required in which a plate-like flange member may be firmly secured at the front end of a hollow shaft member through a plastic working treatment by virtue of caulking combination, so as to manufacture a hollow shaft having a flange at one end thereof.

Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.

Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.